Supplemental Financial Statement Data (Schedule Of Statements Of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 29, 2012	Jul. 31, 2011	Aug. 01, 2010
Supplemental Financial Statement Data [Abstract]
Non-cash compensation/benefit related expense	$ 106	$ 104	$ 90
Other	12	4	9
Other non-cash charges to net earnings	118	108	99
Benefit related payments	(84)	(48)	(58)
Other	(2)	(7)	(12)
Other, total	(86)	(55)	(70)
Interest paid	115	142	118
Interest received	8	11	6
Income taxes paid	$ 300	$ 304	$ 333